Renewing crankshaft oil seal: Audi A3 (AUA, BAD, BAG, BBY, …)

🧭 Before you start

Remove the centre and right noise insulation, mark the belt's running direction, lock the tensioner with a 4 mm Allen key and remove the belt and crankshaft pulley. Set the oil seal extractor, screw it firmly into the seal and draw the seal out, then clean the running and sealing surfaces. Slide the new seal over the guide sleeve, remove the sleeve and drive the seal in to the stop. Refit the pulley and belt in its original running direction.

Fits: Audi A3 (8P, 2003–2012)

• Special tools named: T10172/2

Don't miss

• Mark the poly V-belt's direction of rotation; refitting it reversed can cause breakage.
• Lock the tensioner with a 4 mm Allen key before removing the belt.
• Fit the new seal dry: do not lubricate the sealing lip or outer rim.
• Use guide sleeve T10117/2 and drive the seal in squarely to the stop.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📐 44 workshop diagrams for AUA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Remove centre noise insulation (fasteners 1 ... 3).
2. Remove noise insulation (right-side) (fasteners 1 ... 3). [Note: Before removing, mark direction of rotation of poly V-belt with chalk or felt-tipped pen. If the belt runs in the opposite direction when it is refitted, this can cause breakage.]
3. Turn the tensioner in the direction of the (arrow) to slacken the poly V-belt.
4. Lock the belt tensioner with a 4 mm Allen key (item 1).
5. Remove poly V-belt.

6. Remove crankshaft pulley; use tool T10172 with T10172/2 to counterhold.
7. Adjust inner part of oil seal extractor3203 so that it is level with the outer part and lock in position with knurled screw.
8. Lubricate threaded head of oil seal extractor, place it in position and screw it into oil seal as far as possible (applying firm pressure).
9. Loosen knurled screw and turn inner part towards crankshaft until the oil seal is pulled out.
10. Clamp flats of oil seal extractor in vice and use pliers to remove seal.
11. Clean running surface and sealing surface. [Note: Do not lubricate sealing lip and outer rim of oil seal before pressing in.]
12. Fit guide sleeve T10117/2 onto crankshaft bush and slide oil seal over guide sleeve.
13. Detach guide sleeve.
14. Drive in oil seal carefully as far as stop using assembly tool T10117 and a hammer.
15. Install crankshaft pulley .
16. Install poly V-belt .

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